That front sight is brazed on, not glued. Several people have inquired about how to remove it, myself included. I like the gun but can't push myself into buying one until I see how someone solved the front sight issues. To fill that bigger hole between sight base screws, I would disassemble receiver and tape over the outside of the big hole with a small piece of masking tape. Fill the hole flush from the inside with JB Weld. Let it set up and remove tape. Hole should be filled flush with top of receiver and JB dries black. You could put your tape on the inside of the receiver and fill from the outside if you are careful and wipe off any excess you might get on the gun. If you have an exacto knife, you could put a small piece of tape on receiver and cut it out of that larger hole, then fill. JB is permanent so the only way you could get it out of that hole would be to drill it out if you wanted to put sight back….